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| Number | Title | Issue Date |
| 7773966 | Mobile terminal and method of reducing interfering phase-noise in the mobile terminal A mobile terminal capable of breaking a phase-noise signal caused by a high power transmission signal of a mobile phone such as GSM when receiving digital TV broadcasting such as DVB-H and a method of reducing interfering phase-noise in the mobile terminal. The mobi... | 08/10/2010 |
| 7526265 | Method and system for receiver impairment estimation and correction Embodiments of a receiver impairment estimation and correction system and method that can be implemented in a low intermediate frequency receiver system are disclosed. In one embodiment, among others, a method for operating a receiver is disclosed that comprises rec... | 04/28/2009 |
| 7515894 | System and method for providing a multiband antenna A system and a method for wireless communications includes an antenna, a GPS circuit with a GPS matching circuit that is coupled to the antenna, a communications circuit with a communications matching circuit that is coupled to the antenna. The communications matchi... | 04/07/2009 |
| 7477885 | DC offset cancellation circuits and methods Embodiments of the present invention include circuits and methods for reducing DC Offset. In one embodiment the present invention includes storing DC offset on internal capacitances. In one embodiment, parallel stages are used to remove DC offset corresponding to di... | 01/13/2009 |
| 7437135 | Joint channel equalizer interference canceller advanced receiver At least one communication is transmitted from a plurality of transmitting antennas. A signal is received. For each transmitting antenna, the received signal is equalized with respect to a channel experience by the communication between the transmitting antenna and ... | 10/14/2008 |
| 7366475 | Signal strength measurements in cellular telecommunication systems A mobile station (MS) and method for estimating received signal strength of a radio signal from a neighboring cell in a cellular radio telecommunication network. The MS measures the received signal strength of the radio signal over a plurality of frames, and calcula... | 04/29/2008 |
| 7277688 | DC offset correction for very low intermediate frequency receiver A wireless receiver includes a local oscillator, a mixer, a band pass filter, a DC offset determination module, a DC offset correction module, a subtraction module, and a down converter. The local oscillator produces a local oscillation that a mixer uses to down con... | 10/02/2007 |
| 7269391 | Tunable transceiver front end A transceiver front end includes a transmit/receive (T/R) switch, a first balun, a second balun, a low noise amplifier, a power amplifier, and compensation circuitry. The T/R switch is operably coupled to an antenna for receiving inbound radio frequency (RF) signals... | 09/11/2007 |
| 7228120 | Circuit and method for reducing direct current biases A method is provided for reducing a DC bias in a receiver. This method includes isolating a second circuit portion from a first circuit portion (535) and determining a second DC bias correction value for the second circuit portion that will eliminate a second... | 06/05/2007 |
| 7099385 | Compensation for interference in data receivers A data communication receiver comprises an equalizer for adapting to each of a plurality of channels to open the eye for each channel in a Gigabit (1000BASE-T) transceiver. The eye is open for a first channel (A) and a transformation process applies the coefficients... | 08/29/2006 |
| 6996164 | Self-interference removal using converter compensation in a relayed communication system Self-interference cancellation in two-way relayed communications is improved by creating models of upconverter and downconverter imperfections and then compensating for those imperfections before self interference cancellation processing. The model includes compensa... | 02/07/2006 |
| 6977977 | Compensation of I/Q gain mismatch in a communications receiver A novel and useful apparatus for and method of I/Q gain mismatch compensation for use in a communications receiver. The invention is operative to calculate an estimate of the I/Q gain mismatch. Each input sample is subsequently multiplied by the inverse of the estim... | 12/20/2005 |
| 6970682 | Wireless packet switched communication systems and networks using adaptively steered antenna arrays Methods, apparatuses and systems are provided for use in a wireless routing network. One apparatus, for example, includes an adaptive antenna that is configurable to receive a transmission signal from a transmitter and in response transmit corresponding outgoing mul... | 11/29/2005 |
| 6941121 | Method for calibrating a DC offset cancellation level for direct conversion receivers A method for measuring a difference in DC offsets associated with different gain settings in a direct conversion receiver having a variable gain is provided. In a first phase, a set of response parameters that characterize a time-dependent system response to a known... | 09/06/2005 |
| 6901121 | Compensation of DC offset impairment in a communications receiver A novel and useful apparatus for and method of DC offset compensation for use in a communications receiver. The invention is operative to calculate an estimate of the DC offset which is subsequently subtracted from each input sample to generate compensated samples. ... | 05/31/2005 |
| 6836673 | Mitigating ghost signal interference in adaptive array systems A method and apparatus for mitigating co-channel and inter-channel interference in an antenna array system. It is determined by a base station or other transmitter employing an antenna array that transmission of at least a first downlink signal will generate a co-ch... | 12/28/2004 |
| 6813486 | RF circuit An RF circuit configured to inteface a balanced port (1, 2, 11, 12) with an unbalanced port (4, 14) by emulating the function of a balun. Reactive components (20, 30, 120, 130) in both branches of a balanced circuit form two resonant circuits by... | 11/02/2004 |
| 6725017 | Multi-channel self-interference cancellation method and apparatus for relayed communication Multi-channel self-interference cancellation is provided in relayed electromagnetic communication between a first device and one or more other devices on one or more shared frequency channels. Specifically, near signals are generated at the first device and transmit... | 04/20/2004 |
| 6721544 | Duplexer structure for coupling a transmitter and a receiver to a common antenna A duplexer structure for allowing an RF transmitter and an RF receiver to share a common antenna includes impedance matching circuitry to match the receiver input impedance to the antenna impedance during a receive operation and impedance transformation circuitry to... | 04/13/2004 |
| 6718157 | Apparatus for commonly using antenna for call signal and television broadcasting signal in radio communication terminal Disclosed is an apparatus for commonly using an antenna for a call signal and a television (TV) broadcasting signal in a radio communication terminal including an antenna, a phone duplexer, a TV tuner, an LC parallel circuit, connected between the antenna and the ph... | 04/06/2004 |
| 6711393 | Radio receiver A direct conversion receiver is disclosed, in which a DC offset is estimated in two stages. A coarse DC estimation is performed, and the estimate is removed from the received sequence. Then, a coarse synchronization is performed in order to estimate the synchronizat... | 03/23/2004 |
| 6704559 | Broadband RF mixer with improved intermodulation suppression An RF mixer circuit having reduced intermodulation products includes a cascode transconductance amplifier including a first transistor having a control electrode connected to receive an input signal and serially connected with a second transistor having a... | 03/09/2004 |
| 6507728 | Radio transceiver and a method of preventing transmission spurious response In a radio transceiver operating in a time division duplex system, a cancellation use transmission signal which is reverse in phase and equal in amplitude to a leakage transmission signal from an antenna in the signal transmission is supplied to an input ... | 01/14/2003 |
| 6311045 | Apparatus for signal isolation in a radio transmitter-receiver A radio communications transceiver which operates to transmit radio signals via a transmit antenna and receive radio signals via a receive antenna, wherein said transmit and receive antennas are disposed to provide at least a substantial amount of radio s... | 10/30/2001 |
| 6137996 | Apparatus and method for overcoming the effects of signal loss due to a multipath environment in a mobile wireless telephony system A communications device transmitting and receiving RF signals having an antenna including an antenna core, a plurality of first polarized antenna elements wound about the antenna core in a first direction, a plurality of second polarized antenna elements ... | 10/24/2000 |
| 5907371 | Connector switch apparatus which can provide either a satellite or cable television signal or a ghost-free off-air television signal Connector switch apparatus which can provide either a cable or satellite television signal or a ghost-free off-air television signal. The apparatus obtains the cable or satellite television signal from a cable or satellite tuner, which can be included in ... | 05/25/1999 |
| 5812942 | Balanced differential radio receiver and method of operation A balanced differential radio receiver (100) has an antenna (64) operative for receiving a modulated signal. A first pair of mixers (110, 112) each having an input that receives an output (106, 108) of the antenna (64) and each of the first pair of mixers... | 09/22/1998 |
| 5678219 | Integrated electronic warfare antenna receiver An RF antenna and an associated receiver are proximately located in an integrated antenna/receiver unit thereby eliminating the need for baluns and inter-component cabling characteristic of prior designs. Integration of the receiver with the antenna provi... | 10/14/1997 |
| 5654766 | Television tuning systems and methods employing use of ghost cancellation and antenna directionality control to produce a ghost-free television signal Television tuning systems and methods employing use of ghost cancellation and antenna directionality control to produce a ghost-free television signal. The invention employs use of a antenna whose directionality can be changed to change reception quality ... | 08/05/1997 |
| 5568158 | Electronic variable polarization antenna feed apparatus Electronically adaptable polarization antenna feed apparatus for receiving any sense of linear polarization or for receiving either sense of circular polarization. The circuit makes use of variable gain amplifiers and/or variable attenuators in each of tw... | 10/22/1996 |
| 5369663 | Spatial combiner for a digital VLF/LF receiver A spatial combiner for connection to a receiver used in conjunction with a lurality of direction-sensitive antennas for receiving a spread-spectrum communication signal in the presence of interference includes a steering network, a plurality of normalizers... | 11/29/1994 |
| 5343496 | Interference suppression in CDMA systems Circuitry and concomitant methodology for demodulating Direct-Sequence, Spread-Spectrum Code-Division Multiple-Access (DS/SS CDMA) channel signal using multiple samples per transmitted symbol and a minimum mean squared error criterion to suppress interfer... | 08/30/1994 |
| 5109533 | Method and apparatus for cancelling noise in a received signal by signal subtraction An industrial measuring apparatus comprises first and second sensors having identical measuring characteristics and arranged close to each other and also close to a common subject of measurement, for measuring the same parameter, a transmitting unit havin... | 04/28/1992 |
| 5105435 | Method and apparatus for cancelling spread-spectrum noise A spread-spectrum noise canceller is provided for cancelling user code noise from a spread-spectrum communication channel. The spread-spectrum noise canceller including a receiver for receiving a spread-spectrum signal including a first and at least a sec... | 04/14/1992 |
| 4893128 | Troposcatter diversity sidelobe jamming suppressor Sidelobe jamming in dual diversity troposcatter link receivers is effectively suppressed by providing an auxilliary low power antenna, the output of which is differenced from the high power main antenna signals prior to processing in the receivers's dual ... | 01/09/1990 |
| 4847860 | Phase-control system for telecommunications signals received by an adaptive antenna In a receiving station having an adaptive receiving antenna, a phasing system comprises a plurality of reception paths receiving telecommunications signals derived from the same useful signal combined in transmission with a disturbing signal having a freq... | 07/11/1989 |
| 4670885 | Spread spectrum adaptive antenna interference canceller An adaptive power equalizer circuit for use in a spread spectrum receiver system which includes an antenna system 12, 13 and a receiver 11, the circuit comprising adaptive power inversion circuitry 15 for producing a first signal having a minimized power ... | 06/02/1987 |
| 4612669 | Antenna matching system A system for adjusting the antenna matching network of a radio system in the presence of an interfering signal in the matching network being adjusted comprises a loop from which the interfering signal is cancelled by an adaptive interference cancellation ... | 09/16/1986 |
| 4480338 | Lowpass-highpass electronic switch A multichannel communications receiver, e.g. a CATV converter, includes a switched filter for reducing third order intermodulation distortion by limiting the number of channels processed by the receiver. In a preferred embodiment, the filter is switchable... | 10/30/1984 |
| 4464768 | Adaptive preprocessing system The present invention preprocesses serial data sample sets so that truly ependent samples are available for further processing. Samples to be analyzed are delayed and compared in order to isolate both components that are correlated between samples, and c... | 08/07/1984 |
